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Scrutinizing the structural, opto-electronic, mechanical, and thermoelectric properties of semiconductor lead-free double perovskites A2AgMoBr6 (A = K, Rb, Cs)

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Abstract

The structural, optical, electronic, and transport properties of A2AgMoBr6 (A = K, Rb, Cs) have been examined using first-principles calculations in the present study. The measured value of Paugh’s ratio (B/G) in mechanical computations discloses the material’s ductility. The computed negative value of enthalpy of formation (ΔH) suggests that the examined materials are stable. The assessment of band structure reveals that the A2AgMoBr6 (A = K, Rb, Cs) compound has an indirect bandgap (L-X). The materials under examination have an incredible absorption coefficient (α(ω)) in the ultraviolet and visible regions of the light spectra, making them suitable for photovoltaic and optical equipment manufacturing. In addition, the transport characteristics have been projected using the BoltzTraP code at temperatures ranging from 100 to 1000 K. The estimated value of the figure of merit (zT) 0.89, 0.92, and 0.85 for K, Rb, and Cs respectively at room temperature suggests that A2AgMoBr6 (A = K, Rb, Cs) compounds are perfect contenders for thermoelectric device applications.

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The datasets generated during and/or analyzed during the current study would be available from the corresponding author upon reasonable request.

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  1. Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University Gwalior, Gwalior, 474011, India

    Danish Abdullah & Dinesh C. Gupta

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Both authors have significantly contributed to the research. DA: conceptualization, methodology, writing—original draft, revision; and DCG: supervision, software, validation, writing—review, and modification.

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Correspondence to Danish Abdullah or Dinesh C. Gupta.

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Abdullah, D., Gupta, D.C. Scrutinizing the structural, opto-electronic, mechanical, and thermoelectric properties of semiconductor lead-free double perovskites A2AgMoBr6 (A = K, Rb, Cs). Opt Quant Electron 55, 1277 (2023). https://doi.org/10.1007/s11082-023-05493-2

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